21031021312222 has 16 divisors (see below), whose sum is σ = 33206998199760. Its totient is φ = 9962025993792.

The previous prime is 21031021312183. The next prime is 21031021312229. The reversal of 21031021312222 is 22221312013012.

It is a junction number, because it is equal to n+sod(n) for n = 21031021312193 and 21031021312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031021312229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11377138 + ... + 13095850.

It is an arithmetic number, because the mean of its divisors is an integer number (2075437387485).

Almost surely, 2^{21031021312222} is an apocalyptic number.

21031021312222 is a deficient number, since it is larger than the sum of its proper divisors (12175976887538).

21031021312222 is a wasteful number, since it uses less digits than its factorization.

21031021312222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040747.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21031021312222 its reverse (22221312013012), we get a palindrome (43252333325234).

The spelling of 21031021312222 in words is "twenty-one trillion, thirty-one billion, twenty-one million, three hundred twelve thousand, two hundred twenty-two".